This works for both positive and negative numbers:
private static bool isEven(int number)
{
bool result = true;
while (number < 0)
{
number = number - 1;
if (result == true)
result = false;
else
result = true;
}
while (number > 0)
{
number = number - 1;
if (result == true)
result = false;
else
result = true;
}
return result;
}
Output:
isEven(4) = True
isEven(5) = False
isEven(-4) = True
isEven(-5) = False
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